Remediation method and device for heavy metal polluted soil based on leaf exocrine mechanism

Abstract

The invention discloses a repair method of heavy metal polluted soil based on a blade eccrine mechanism. Heavy metal enrichment plants with a blade eccrine function are planted in the heavy metal polluted soil; leaching liquid collecting devices are arranged at base parts of all the heavy metal enrichment plants with the eccrine function; during raining or leaching, blade eccrine heavy metal is leached, and is recovered through the leaching liquid collecting devices; and the leaching liquid collecting devices comprise leaching liquid collecting discs sleeving the base parts of the plants, leaching liquid collecting ports formed in the bottoms of the collecting discs, and leaching liquid storage barrels positioned below the leaching liquid collecting ports. Heavy metal pollutants can be continuously extracted from the soil to prevent poison and harm caused by excessive accumulation of the heavy metal in the plants; and heavy metal cleaning liquid is simply treated after concentration, so that the trouble of treating a lot of plant residues is prevented, and the risk of secondary pollution is prevented.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal environmental pollution, and in particular relates to a method and a device for remediating heavy metal-polluted soil by using a special plant with the function of leaf exuding heavy metals. Background technique [0002] Soil heavy metal pollution has become a very serious and global environmental problem. The phytoremediation technology of heavy metal pollution mainly relies on plants with the ability to enrich or super-accumulate various heavy metals, using plant roots to absorb heavy metal pollutants in the soil, and transport them to the stems and leaves of the aboveground parts, so that the heavy metals in the soil Gradually enriched in the roots, stems and leaves of plants, and the purpose of removing heavy metal pollutants in the soil is achieved by harvesting the plants. Since heavy metal pollutants such as cadmium, lead, and chromium have strong physiological toxicity ...

AI Technical Summary

Problems solved by technology

Since heavy metal pollutants such as cadmium, lead, and chromium have strong physiological toxicity to plants, the tolerance of plants to heavy metals is very limited, and when a certain concentration is reached, the plants will fail and die. The phytoremediation technology established by the enrichment mechanism of plants has the following defects: 1) It can only remediate the low-concentration heavy metal-contaminated soil that some plants can tolerate, and the high-concentration pollution in pollution source areas such as tailings and chemical factories The soil is powerless and has great limitations; 2) the post-treatment of the harvested plants is difficult, because the heavy metal content of the plant body enrichment is low, and the harvested plant body is huge, generally every hectare enriches the biological content of the plant every season. The amount can reach 10,000 to 100,000 kilograms, which cannot be disposed of directly in landfill. It needs to be incinerated and concentrated before it can be disposed of through recycling or landfill. The drying and incineration of plants require a very large treatment site and large Only a large amount of investment can be realized, which seriously restricts the feasibility of phytoremediation technology; 3) The risk of secondary pollution is high, and every step of harvesting, drying, incineration, and ash treatment of plants enriched in heavy metals is difficult in a completely closed environment. Once it spreads, it will cause secondary pollution to the surrounding environment

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